definition of
instant

[1] #1 instant n. [blink of an eye, flash, heartbeat, jiffy, split second, trice, twinkling, wink, New York minute] a very short time (as the time it takes the eye to blink or the heart to beat); "if I had the chance I'd do it in a flash". wn

[2] #2 instant n. [moment, minute, second] a particular point in time; "the moment he arrived the party began". wn

[3] #3 instant s. [instantaneous] occurring with no delay; "relief was instantaneous"; "instant gratification". wn

[4] #4 instant s. [clamant, crying, exigent, insistent] demanding attention; "clamant needs"; "a crying need"; "regarded literary questions as exigent and momentous"- H.L.Mencken; "insistent hunger"; "an instant need". wn